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This is the build-along course for the workflow Turn LinkedIn post reactions into AI content ideas in Google Sheets. Follow it node by node, live, to re-create the automation from scratch. Every prompt, expression and value is in a copy-paste code block.

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What you will build

Every day, the workflow pulls the LinkedIn posts you reacted to, keeps only the recent ones, asks GPT to reframe each one into an original content idea (angle, hook, takeaway, format, hashtags), and saves everything into a Google Sheet — with no duplicates.

flowchart LR
  A["Daily Trigger"] --> B["Configuration"]
  B --> C["Fetch LinkedIn Reactions"]
  C --> D["Split Reactions"]
  D --> E["Filter Recent Reactions"]
  E --> F["Limit AI Analysis"]
  F --> G["AI Content Strategist"]
  G --> H["Format Idea Row"]
  H --> I["Save to Google Sheets"]

The AI Content Strategist has two attached sub-nodes: an OpenAI Chat Model (the brain) and a Content Idea Parser (forces clean JSON output).

Prerequisites & credentials

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You need three credentials. Never paste API keys directly into a node — always store them in n8n credentials.

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Create the RapidAPI credential (step by step)

1. Go to rapidapi.com, create/sign in to your account.
2. Search for linkedin-api8 (Real-Time LinkedIn Scraper) and Subscribe (a free tier exists).
3. On the API playground, copy your X-RapidAPI-Key.